Centennial Defense Systems MOD4 Stainless Steel Guide Rod Assembly for Smith & Wesson M&P 5in Barrel, Stainless Steel, No Coating, Button Head Allen Screw, 15lb Spring, 12721

This eliminates guide rod flex and ensures it will not chip crack or break like plastic guide rods providing a lifetime of reliable service. Flat wound recoil springs are manufactured of certified aerospace spec materials heat treated shot peened and stress relieved to maximize durability.